Intel HD 4000 and ATI 7670M Graphics issue

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I have HP envy 14 ultrabook Running Niresh 10.9. Everything works smoothly except launchpad, Safari and Video. the issue is with my graphics card i think. Intel HD 4000 shows only 64MB and in system report there are both graphics card shown ATI + Intel 4000. How i make ATI default graphic card or any other fix for this problem ? Any specific kext for ATI 7670M 2GB ?